android 4.0 USB Camera執行個體(二)應用程式層

上一篇說了HAL層 這一篇具體應用HAL層 執行個體預覽與拍照的功能

首先貼上兩個主檔案的源碼

Fimcgzsd.java

package com.dao.usbcam;public class Fimcgzsd {static public native int open(byte[] devname);static public native int qbuf(int index);static public native int streamon();static public native int streamoff();static public native int dqbuf(byte[] videodata);static public native int release();static public native int init(int width, int height,int numbuf);static {System.loadLibrary("fimcgzsd");}}

這個主要是HAL層的一些介面函數

MainActivity.java

package com.dao.usbcam;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Environment;import android.os.Handler;import android.text.format.Time;import android.view.Menu;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {private ImageView mImag;private int width = 640;private int height = 480;private String devname = "/dev/video3";private byte[] mdata;private Handler mHandler;private int numbuf = 0;private int index = 0;private int ret = 0;public Button mcap;private Bitmap bitmap;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.activity_main);mImag = (ImageView)findViewById(R.id.mimg);mcap = (Button)findViewById(R.id.mcap);numbuf  = 4;mdata = new byte[width * height * numbuf];ret = Fimcgzsd.open(devname.getBytes());if(ret < 0)finish();ret = Fimcgzsd.init(width, height, numbuf);if(ret < 0)finish();ret = Fimcgzsd.streamon();if(ret < 0)finish();mHandler = new Handler();new StartThread().start();mcap.setOnClickListener(new CaptureListener());}final Runnable mUpdateUI = new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubmImag.setImageBitmap(bitmap);    }};class StartThread extends Thread {@Overridepublic void run() {// TODO Auto-generated method stub//super.run();while(true) {index = Fimcgzsd.dqbuf(mdata);if(index < 0) {onDestroy();break;}mHandler.post(mUpdateUI);bitmap = BitmapFactory.decodeByteArray(mdata, 0, width * height);Fimcgzsd.qbuf(index);}}}public static void saveMyBitmap(Bitmap mBitmap) {    Time mtime = new Time();    mtime.setToNow();    File fdir = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/" + "/gzsd/");    if(!fdir.exists()) {    fdir.mkdir();    }        File f = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/" + "/gzsd/" + mtime.year + mtime.month + mtime.monthDay + mtime.hour + mtime.minute +mtime.second+".png");        try {                f.createNewFile();        } catch (IOException e) {        e.printStackTrace();        }        FileOutputStream fOut = null;        try {                fOut = new FileOutputStream(f);                mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);                fOut.flush();                fOut.close();        } catch (FileNotFoundException e) {        e.printStackTrace();        } catch (IOException e) {        e.printStackTrace();        }    }    class CaptureListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stub//new CapThread().start();//Fimcgzsd.streamoff();saveMyBitmap(bitmap);//Fimcgzsd.streamon();Toast.makeText(MainActivity.this, "Capture Successfully", Toast.LENGTH_LONG).show();}        }    class CapThread extends Thread {@Overridepublic void run() {// TODO Auto-generated method stub//super.run();saveMyBitmap(bitmap);Toast.makeText(MainActivity.this, "Capture Successfully", Toast.LENGTH_LONG).show();}}@Overrideprotected void onStop() {// TODO Auto-generated method stubsuper.onStop();Fimcgzsd.release();finish();}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();Fimcgzsd.release();finish();}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Fimcgzsd.release();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);finish();return true;}}

整體過程 其實很簡單

首先open

這裡usb camera裝置為/dev/video3 為了修改方面所以我把這個參數放在應用程式層裡傳到HAL層 解析度為640*480

然後init

Fimcgzsd.init(width, height, numbuf);

傳入寬，高 以及 緩衝幀的數目

然後開啟視頻流

Fimcgzsd.streamon();

開另外一個進程 迴圈擷取資料 由於這裡擷取到的資料直接是jpeg格式的所以 我直接把他轉成bmp然後用imageview直接顯示 又省了不少事

貼上我的

30W像素的網路攝影機，目前capture似乎還有問題，似乎是驅動有問題 繼續研究中...

============================================
作者：hclydao
http://blog.csdn.net/hclydao
著作權沒有，但是轉載請保留此段聲明

============================================